Strongly coupled oxygen reservoir enabled highly efficient solid oxide fuel cell cathode operation under harsh conditions

2022 ◽  
Vol 521 ◽  
pp. 230933
Author(s):  
Qiuqiu Lyu ◽  
Nuo Wang ◽  
Zhishan Li ◽  
Meilan Peng ◽  
Hongxia Qu ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Strongly Coupled ◽  
Highly Efficient ◽  
Fuel Cell Cathode ◽  
Harsh Conditions ◽  
Cell Cathode

Multiscale Transient and Steady-State Study of the Influence of Microstructure Degradation and Chromium Oxide Poisoning on Solid Oxide Fuel Cell Cathode Performance

2018 ◽  
Vol 43 (1) ◽  
pp. 21-42 ◽  
Author(s):  
Guanchen Li ◽  
Michael R. von Spakovsky ◽  
Fengyu Shen ◽  
Kathy Lu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Oxygen Reduction ◽  
Chromium Oxide ◽  
Spatial Scales ◽  
Solid Oxide ◽  
Heat Diffusion ◽  
Oxide Fuel ◽  
Fuel Cell Cathode ◽  
Cell Cathode

AbstractOxygen reduction in a solid oxide fuel cell cathode involves a nonequilibrium process of coupled mass and heat diffusion and electrochemical and chemical reactions. These phenomena occur at multiple temporal and spatial scales, making the modeling, especially in the transient regime, very difficult. Nonetheless, multiscale models are needed to improve the understanding of oxygen reduction and guide cathode design. Of particular importance for long-term operation are microstructure degradation and chromium oxide poisoning both of which degrade cathode performance. Existing methods are phenomenological or empirical in nature and their application limited to the continuum realm with quantum effects not captured. In contrast, steepest-entropy-ascent quantum thermodynamics can be used to model nonequilibrium processes (even those far-from equilibrium) at all scales. The nonequilibrium relaxation is characterized by entropy generation, which can unify coupled phenomena into one framework to model transient and steady behavior. The results reveal the effects on performance of the different timescales of the varied phenomena involved and their coupling. Results are included here for the effects of chromium oxide concentrations on cathode output as is a parametric study of the effects of interconnect-three-phase-boundary length, oxygen mean free path, and adsorption site effectiveness. A qualitative comparison with experimental results is made.

Co-synthesized (La0.8Sr0.2)0.9MnO3Y0.15Zr0.85O2 composite for solid oxide fuel cell cathode

2016 ◽  
Vol 41 (46) ◽  
pp. 21385-21393 ◽  
Author(s):  
Zhongbo Liu ◽  
Xiaomin Zhang ◽  
Zhidong Huang ◽  
Zhe Zhao ◽  
Daan Cui ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Fuel Cell Cathode ◽  
Cell Cathode
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